$OpenBSD: patch-Makefile,v 1.1 2014/06/01 15:11:55 jturner Exp $
--- Makefile.orig	Sun Jun  1 11:07:56 2014
+++ Makefile	Sun Jun  1 11:08:05 2014
@@ -3,7 +3,7 @@ MAN=		pop3d.8
 CFLAGS+=	-Wall -Wstrict-prototypes -Wmissing-prototypes
 CFLAGS+=	-Wmissing-declarations -Wshadow -Wpointer-arith
 CFLAGS+=	-Wcast-qual -Wsign-compare
-CFLAGS+=	-DIO_SSL
+CPPFLAGS+=	-DIO_SSL
 DEBUG=		-g
 SRCS=		pop3d.c pop3e.c session.c maildrop.c maildir.c mbox.c util.c
 SRCS+=		imsgev.c iobuf.c ioev.c
